The study looked at how well two regional climate models predict precipitation in south-western Germany compared to actual observations. They used data from a global climate model to drive the regional models. The results showed that the models tend to overestimate precipitation in winter, especially in mountainous areas. However, the models performed better in spring and summer. The researchers found that the regional models are more influenced by the global model in winter than in summer. Overall, the regional models can provide more accurate predictions of precipitation during the summer months.